Dr Knowles and Professor McCork ask the question 'Which animal has the best eyesight?', and we meet some creatures with truly amazing vision - from the bug-eyed to the eagle-eyed to those that can see in the dark! Meanwhile, backstage, Dr Knowles, Professor McCork and Ms Hucklebuck have become completely obsessed with their gadgets, phones and tablets, and Colin attempts to bring them back to the real world. But will Colin's 'real world' be entertaining enough?